FREMONT -- Police on Sunday continued to search for a missing 15-year-old girl who disappeared from her uncle's home in the city one week ago.

Margarita Nunez Chavez was discovered missing from her uncle's home in the Irvington area of Fremont on May 5. She was last seen at 10 p.m. May 4,¿ said police spokeswoman Geneva Bosques.

Police do not believe she was abducted, but said she may be with 30-year-old Ryan Griggs, who is possibly driving a stolen white Ford F150 pickup with a white camper shell and raised suspension. The truck's license plate reads 6E82209.